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CERN Document Server 2,049 εγγραφές βρέθηκαν  1 - 10επόμενοτέλος  μετάβαση στην εγγραφή: Η έρευνα πήρε 0.29 δευτερόλεπτα. 
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Usage of the Transverse Damper Observation Box for High Sampling Rate Transverse Position Data in the LHC / Carver, Lee (CERN) ; Buffat, Xavier (CERN) ; Butterworth, Andrew (CERN) ; Höfle, Wolfgang (CERN) ; Iadarola, Giovanni (CERN) ; Kotzian, Gerd (CERN) ; Li, Kevin (CERN) ; Métral, Elias (CERN) ; Ojeda Sandonís, Miguel (CERN) ; Söderén, Martin (CERN) et al.
The transverse damper observation box (ADTObsBox) is a device that makes accessible the bunch-by-bunch turn-by-turn data recorded from the pickups of the LHC transverse damper. This device can provide online transient analysis of different beam dynamics effects (tunes and damping times at injection, for example), while also under development is an online coherent instability triggering system. [...]
CERN-ACC-2017-117.- 2017 - 4 p. - Published in : 10.18429/JACoW-IPAC2017-MOPAB113 Fulltext: PDF;
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.MOPAB113
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Online Bunch by Bunch Transverse Instability Detection in LHC / Söderén, Martin (CERN) ; Kotzian, Gerd (CERN) ; Ojeda Sandonís, Miguel (CERN) ; Valuch, Daniel (CERN)
Reliable detection of developing transverse instabilities in the Large Hadron Collider is one of the main operational challenges of the LHC's high intensity proton run. A full machine snapshot provided from the moment of instability is a crucial input to develop and fine tune instability models. [...]
CERN-ACC-2017-115.- 2017 - 3 p. - Published in : 10.18429/JACoW-IPAC2017-MOPAB117 Fulltext: PDF;
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.MOPAB117
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Processing High-Bandwidth Bunch-by-Bunch Observation Data from the RF and Transverse Damper Systems of the LHC / Ojeda Sandonís, Miguel (CERN) ; Baudrenghien, Philippe (CERN) ; Butterworth, Andrew (CERN) ; Galindo, Javier (CERN) ; Höfle, Wolfgang (CERN) ; Levens, Thomas (CERN) ; Molendijk, John (CERN) ; Vaga, Federico (Pavia U.) ; Valuch, Daniel (CERN)
The radiofrequency and transverse damper feedback systems of the Large Hadron Collider digitize beam phase and position measurements at the bunch repetition rate of 40 MHz. Embedded memory buffers allow a few milliseconds of full rate bunch-by-bunch data to be retrieved over the VME bus for diagnostic purposes, but experience during LHC Run I has shown that for beam studies much longer data records are desirable. [...]
2015 - 4 p. - Published in : 10.18429/JACoW-ICALEPCS2015-WEPGF062 Fulltext: PDF; External link: JACoW
In : 15th International Conference on Accelerator and Large Experimental Physics Control Systems, Melbourne, Australia, 17 - 23 Oct 2015, pp.WEPGF062
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Transverse Coupling Measurements With High Intensity Beams Using Driven Oscillations / Persson, Tobias (CERN) ; Baud, Guillaume (CERN) ; Buffat, Xavier (CERN) ; Coello de Portugal, Jaime Maria (CERN) ; Fol, Elena (CERN) ; Fuchsberger, Kajetan (CERN) ; Gabriel, Mathieu (CERN) ; Gąsior, Marek (CERN) ; Giovannozzi, Massimo (CERN) ; Hemelsoet, Georges-Henry (CERN) et al.
Transverse coupling has been linked to instabilities and reduction in dynamic aperture and is hence a crucial parameter to control in the LHC. In this article we describe the development to use driven oscillations to measure the transverse coupling with high intensity beams. [...]
CERN-ACC-2018-079.- 2018 - 4 p. - Published in : 10.18429/JACoW-IPAC2018-MOPMF047 Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.MOPMF047
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ADTOBSBOX to catch instabilities / Söderén, M E (CERN) ; Valuch, D (CERN)
During Long Shutdown 2 (2019–2020) the transverse observation system (ADTObsBox) in the LHC will undergo a substantial upgrade. The purpose of this upgrade is to allow for true low latency, online processing of the 16 data-streams of transverse bunch-by-bunch, turn-by-turn positional data provided by the beam position monitors in transverse feed-back system in the LHC (ADT). [...]
2020 - 2 p. - Published in : 10.23732/CYRCP-2020-009.154 Fulltext: PDF;
In : ICFA mini-Workshop on Mitigation of Coherent Beam Instabilities in Particle Accelerators (MCBI 2019), Zermatt, Switzerland, 23 - 27 Sep 2019, pp.154 (CERN-2020-009)
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Low Latency, Online Processing of the High-Bandwidth Bunch-By-Bunch Observation Data From the Transverse Feedback System in the LHC / Söderén, Martin (CERN) ; Valuch, Daniel (CERN)
During long shutdown 2 (2019-2020) the transverse observation system (ADTObsBox) in the LHC will undergo a substantial upgrade. The purpose of this upgrade is to allow for true low latency, online processing of the 16 data-streams of transverse bunch-by-bunch, turn-by-turn positional data provided by the transverse feedback system in the LHC (ADT). [...]
2020 - 7 p. - Published in : EPJ Web Conf. 245 (2020) 01036 Fulltext from publisher: PDF;
In : 24th International Conference on Computing in High Energy and Nuclear Physics, Adelaide, Australia, 4 - 8 Nov 2019, pp.01036
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Experimental Characterisation of a Fast Instability Linked to Losses in the 16L2 Cryogenic Half-Cell in the CERN LHC / Salvant, Benoit (CERN) ; Antipov, Sergey (CERN) ; Arduini, Gianluigi (CERN) ; Biancacci, Nicolo (CERN) ; Buffat, Xavier (CERN) ; Carver, Lee (CERN) ; Collier, Paul (CERN) ; Gorzawski, Arkadiusz (CERN) ; Höfle, Wolfgang (CERN) ; Iadarola, Giovanni (CERN) et al.
The operation during the summer months of the 2017 Run of the CERN LHC was plagued with fast beam losses that repeatedly occurred in the 16th arc half-cell at the left of IP2 as well as in the collimation insertion, leading to unwanted beam dumps. Transverse coherent oscillations were observed during this fast process. [...]
CERN-ACC-2018-175.- 2018 - 4 p. - Published in : 10.18429/JACoW-IPAC2018-THPAF058 Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.THPAF058
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ADT and Obsbox in LHC Run 2, Plans for LS2 / Söderén, M (CERN) ; Komppula, J (CERN) ; Kotzian, G (CERN) ; Rains, S (CERN) ; Valuch, D (CERN)
The primary function of the LHC transverse feedback (ADT), is to damp the injection oscillations and to actively counteract the coupled-bunch instabilities driven by the machine impedance. While the damping function was there since the LHC start-up in 2008, during Run 2 the ADT also became a very important tool to perform active excitation of all kinds and various beam measurements through the whole cycle. [...]
Geneva, Switzerland : , 2019 - 7 p. - Published in : , pp. 165-171 Fulltext: PDF;
In : 9th LHC Operations Evian Workshop, Evian Les Bains, France, 30 Jan - 1 Feb 2019, pp.165-171
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Transverse Rigid Dipole and Intra-Bunch Oscillation Detection Using the Transverse Feedback Beam Position Detection Scheme in SPS and LHC / Höfle, Wolfgang (CERN) ; Kotzian, Gerd (CERN) ; Valuch, Daniel (CERN)
The LHC and SPS transverse dampers use beam position electronics with I,Q detection at 400 MHz and 200 MHz, of the sum and difference signals from a strip-line pick-up. Digitization is performed to give synchronous bunch-by-bunch data at the rate of 40 MHz corresponding to the bunch spacing of 25 ns. [...]
2016 - 5 p. - Published in : 10.18429/JACoW-IBIC2015-TUPB056 Fulltext: PDF;
In : International Beam Instrumentation Conference , Melbourne, Australia, 13 - 17 Sep 2015, pp.TUPB056
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Transverse Feedback System for the CERN FCC-hh Collider / Höfle, Wolfgang (CERN) ; Komppula, Jani (CERN) ; Kotzian, Gerd (CERN) ; Li, Kevin (CERN) ; Valuch, Daniel (CERN)
For the future hadron Collider (FCC-hh) being studied at CERN a strong transverse feedback system is required to damp coupled bunch instabilities. This system is also planned to be used for injection damping. [...]
CERN-ACC-2018-171.- 2018 - 4 p. - Published in : 10.18429/JACoW-IPAC2018-WEPAF072 Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.WEPAF072
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